Add encourage replacement module

I wrote a replacement module for encourage.coffee. Linking to it from here.

replacements.json

@@ -7,6 +7,7 @@
   "bangbang.coffee": "https://github.com/bdashrad/hubot-bang-bang",
   "coin.coffee": "https://github.com/fordnox/hubot-coin",
   "darksky.coffee": "https://github.com/hubot-scripts/hubot-darksky",
+  "encourage.coffee": "https://github.com/haroldputman/hubot-encourage",
   "factoids.coffee": "https://github.com/hubot-scripts/hubot-factoids",
   "gitlab.coffee": "https://github.com/spruce/hubot-gitlab-hooks",
   "google.coffee": "https://github.com/mnpk/hubot-google",